Tire-repairing tool



Oct 14, 1930. --N. A. F'LUMMER 1,773,636

'- TIRE REPAIRING TOOL Filed Oct. 3, 1929 mvenlor.

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Patented Oct. 14, 1930 UNITED STATES NOR-MAN A. PLUMMER, OF PORTLAND,MAINE TIRE-REPAIRING TOOL Application filed October 3, 1923. Serial No.397,027.

My invention relates, generally, to tools by which repairs to motorvehicle tires are made, but specifically, concerns an implement whichmay advantageously be employed to remove articles embedded in the shoeof the tire, as for instance, nails or tacks which the tire frequentlypicks up during the passage of the vehicle over the street or highway.

It is of common occurrence for a nail to be forced into a shoe in such amanner that its extraction therefrom becomes rather a diiiicult andtedious operation. Often the point of a nail will completely passthrough the shoe, puncture the inner tube and upon the expansion of therubber retract into the shoe so that it is not visible from the inside.The aperture made by the nail closes, and even this spot, except by veryclose inspection, is hard to locate.

The usual practice in such cases is. to make an attempt to withdraw orpull out the nail by applying pinchers or tweezers on its head portion.If the nail has been driven deeply int-o the shoe this operation moreoften than not enlarges the holefurther injuring the tire.

On the other hand, if the operation of removingthe nail is performedfrom the inside of the shoe by inserting a small, flat end tool somewhatafter the order of a nail set into the puncture, the difficultyencountered is the slipping of the smooth end of the tool oh the pointof the nailthe tool passing by without accomplishing the object desired.

In my present invention the working end of the projector is cupped orconcaved so that once the, pointed end of the embedded article islocated no difiiculty is experienced in holding it in contact with thetool, and by outwardly directed force removing the for eign object fromthe tire.

The character of the invention may best be understood by reference tothe description found in the following specification when taken inconnection with the accompanying drawing in which like referencecharacters are employed to identify similar parts in all the differentviews thereof.

In the drawing,

Fig. 1 is a perspective view of the projector;

thereof, part- 7 tool, and

j Fig. 7 is an enlarged'sectional view of the working end of theprojector tool.

Referring to the drawing,- 1 is a handle and 2 1s a steel rod having atapered portion 8. The extreme end is cupped, as at 4:, the depress onpreferably havinga depth at least as great as its diameter This keen,knife-edge border, after being hardened an'd'groundprovides the toolwith facilities which adapt it to incise the side of a nail or othermetal substance embedded in the shoe and as its service is not severeasif operated by being pounded by a mallet or hammer, or like the impactrequired in using a cold chisel, the tool will remain effective evenafter long and continuous use.

In Fig. l'is shown a very common conditlon found'in punctured tires.The. nail 5 has been forced into the shoe 6 until its head 7'lSbEBIlGELlJll'lSl'lB outer surface of the shoe. The tire, whenpunctured by the nail, coinpresses sufficiently to drive the nailcompletely through the outer or shoe portion and wewill assume has alsopunctured the inner tube (not shown). Upon the punctured portion coiningoif the ground,- as the tire revolves, the rubber-expands and thenailretracts so that its point is not visible from the inner a side of theshoe. A casual observation of this inner surface will oftentimes noteven show indications of a puncturehaving been made but close inspectionwill reveal the orifice which has'quite completely closed, and then theend 4 of the projector is inserted therein.

By the sense of feeling the end of the nail may be located with thetool-after which a slight pressure outwardly will eject the nail,

as shown in dotted lines in Fig. 5.

On other occasions a nail or perhaps some other metallic substance hasentered the shoe but does not entirely pass through, nevertheless it isthought best to remove the obstruction. This condition is illustrated inFig. 6 in which the cutting edge of the projector has landed on the sideof the nail 9 and obm tained a hold thereon by shearing into its sidesufficiently to effect an outward movement of the nail so that its headprotrudes beyond the outer surface of the shoe where it then may beeasily withdrawn. The object of this 15 knife-edge on the border of thetool is thus apparent.

It is desirable that in instances like the last one mentioned as small ahole as is possible should be made in the shoe. So for genn eralpurposes the extreme end of the tapered portion of the tool is made nolarger than one sixteenth of an inch in diameter, and even then it isoften advisable to precede the insertion of the projector by a pointedtool to open a passage through which the projecting tool passes to reachthe object to be removed.

In Fig. 7 I show what has proven to be the most efficient and lastingform in which to make the end l of the projector. A halfround nose drillis first used to provide this shape for the bottom of the depression 10,making the depth such that if the full circle was inscribed (see dottedlines) it would fall wholly inside the cutting edge of the tool. Areamer then clears the stock away at the sides, leaving tangential linesfrom the halfround bottom to the cutting edge of the tool. Afterhardening and tempering the outside 40 may be ground to provide a keencutting edge.

The practicability of this simple tool has been thoroughly tested out onnumerous occasions and on various kinds of jobs having to do with theremoval of embedded articles in the shoes of motor vehicle tires, and itis believed that by its use the tire repairer is enabled to reduce thetimeand incidentally the cost, of performing operations of thischaracter.

53 Having thus described my invention, what I claim and desire to secureby Letters Pat ent is:

In a. device of the character described, comprising a tapered shaft,means on the larger end of said shaft for manually gripping the same, asocket 011 the smaller end of said shaft of at least as great a depth asis its diameter. and a cutting edge formed around the margin of saidsocket.

In testimony whereof I affix my signature.

NORMAN A. PLUMMER.

